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      <a href="/2016/06/22/picture-cut/" title="jQuery插件--Canvas实现图片裁剪" itemprop="url">jQuery插件--Canvas实现图片裁剪</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2016-06-22T11:44:20.000Z" itemprop="datePublished">2016-06-22</time>
    更新日期:<time datetime="2018-08-18T12:58:12.526Z" itemprop="dateModified">2018-08-18</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#插件介绍"><span class="toc-number">1.</span> <span class="toc-text">插件介绍</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#使用方法"><span class="toc-number">1.1.</span> <span class="toc-text">使用方法</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#插件封装方法"><span class="toc-number">1.2.</span> <span class="toc-text">插件封装方法</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#图片裁剪原理"><span class="toc-number">2.</span> <span class="toc-text">图片裁剪原理</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#使用HTML5-Canvas实现裁剪过程"><span class="toc-number">2.1.</span> <span class="toc-text">使用HTML5 Canvas实现裁剪过程</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#canvas1"><span class="toc-number">2.2.</span> <span class="toc-text">canvas1</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#canvas2"><span class="toc-number">2.3.</span> <span class="toc-text">canvas2</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#获取裁剪后图片"><span class="toc-number">2.4.</span> <span class="toc-text">获取裁剪后图片</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#鼠标或者触屏事件处理"><span class="toc-number">3.</span> <span class="toc-text">鼠标或者触屏事件处理</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">4.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>需要对图片进行裁剪时，可使用该jQuery插件。本文介绍实现方法。<br><a id="more"></a></p>
<p>代码放在github上，有兴趣的小伙伴可以下载看<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/picture-cut" target="_blank" rel="external">picture-cut</a></p>
<p>最终效果图如下<a href="http://o92md66rk.bkt.clouddn.com/index.html" target="_blank" rel="external">点击查看页面</a><br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/picture-cut.png" alt="image"></p>
<h2 id="插件介绍"><a href="#插件介绍" class="headerlink" title="插件介绍"></a>插件介绍</h2><hr>
<h3 id="使用方法"><a href="#使用方法" class="headerlink" title="使用方法"></a>使用方法</h3><ul>
<li><p>html</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">img</span> <span class="attr">class</span>=<span class="string">"img-to-cut"</span> <span class="attr">src</span>=<span class="string">"img/1.png"</span> /&gt;</span></div><div class="line"><span class="tag">&lt;<span class="name">img</span> <span class="attr">class</span>=<span class="string">"img-to-cut"</span> <span class="attr">src</span>=<span class="string">"img/2.png"</span> /&gt;</span></div><div class="line"><span class="tag">&lt;<span class="name">img</span> <span class="attr">class</span>=<span class="string">"img-to-cut"</span> <span class="attr">src</span>=<span class="string">"img/3.png"</span> /&gt;</span></div><div class="line"><span class="comment">&lt;!--需加上一个包裹的外壳--&gt;</span></div><div class="line"><span class="tag">&lt;<span class="name">section</span> <span class="attr">id</span>=<span class="string">"bsphotocut-con"</span>&gt;</span><span class="tag">&lt;/<span class="name">section</span>&gt;</span></div></pre></td></tr></table></figure>
</li>
<li><p>js</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line"><span class="comment">//初始化能进行裁剪的图片：此处使用class='img-to-cut'</span></div><div class="line">$(<span class="string">".img-to-cut"</span>).click(<span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</div><div class="line">  $(<span class="keyword">this</span>).bsPhotoCut(&#123;</div><div class="line">    <span class="string">"section"</span>: <span class="string">"#bsphotocut-con"</span>, <span class="comment">//外框</span></div><div class="line">    <span class="string">"ratio"</span>: <span class="string">"0"</span>, <span class="comment">//裁剪框宽度和高度比例n:m, 为0则不限比例</span></div><div class="line">    <span class="string">"success"</span>: <span class="function"><span class="keyword">function</span>(<span class="params">src, obj</span>) </span>&#123; <span class="comment">//src为返回图片src, obj为调用此插件的DOM对象this</span></div><div class="line">      <span class="keyword">var</span> _img = $(<span class="string">"&lt;img src='"</span> + src + <span class="string">"' /&gt;"</span>);</div><div class="line">      $(<span class="string">"body"</span>).append(_img);</div><div class="line">    &#125;</div><div class="line">  &#125;);</div><div class="line">&#125;);</div></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="插件封装方法"><a href="#插件封装方法" class="headerlink" title="插件封装方法"></a>插件封装方法</h3><ul>
<li>使用jQuery拓展属性$.fn.xxx来进行封装</li>
<li>这里有超详细教程<a href="http://www.cnblogs.com/Wayou/p/jquery_plugin_tutorial.html" target="_blank" rel="external">《jQuery插件开发精品教程，让你的jQuery提升一个台阶》</a></li>
<li>本插件的封装不是特别完美，因为涉及事件绑定，当时还没想到很好的办法，欢迎小伙伴们提意见</li>
</ul>
<h2 id="图片裁剪原理"><a href="#图片裁剪原理" class="headerlink" title="图片裁剪原理"></a>图片裁剪原理</h2><hr>
<h3 id="使用HTML5-Canvas实现裁剪过程"><a href="#使用HTML5-Canvas实现裁剪过程" class="headerlink" title="使用HTML5 Canvas实现裁剪过程"></a>使用HTML5 Canvas实现裁剪过程</h3><ul>
<li>创建两个canvas：canvas1–装载图片 canvas2–装载裁剪框<h3 id="canvas1"><a href="#canvas1" class="headerlink" title="canvas1"></a>canvas1</h3></li>
<li>装载图片，实现图片居中处理，具体相关原理可参考<a href="https://github.com/godbasin/godbasin.github.io/blob/blog-codes/picture-align/js/style.js" target="_blank" rel="external">picture-align插件</a></li>
</ul>
<h3 id="canvas2"><a href="#canvas2" class="headerlink" title="canvas2"></a>canvas2</h3><ul>
<li>装载裁剪框，若有限制比例则按照比例缩放</li>
<li>裁剪框溢出canvas1时候的处理</li>
</ul>
<h3 id="获取裁剪后图片"><a href="#获取裁剪后图片" class="headerlink" title="获取裁剪后图片"></a>获取裁剪后图片</h3><ul>
<li>使用Canvas函数getImageData可读取特定区域的图片数据</li>
<li>使用Canvas函数putImageData可导出图片数据至canvas</li>
<li>使用Canvas函数toDataURL可将canvas导出为图片格式</li>
<li>这里需要注意，getImageData可能产生跨域问题，解决办法可自行google（似乎没有特别好的解决方法）<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div></pre></td><td class="code"><pre><div class="line">cutOver: <span class="function"><span class="keyword">function</span>(<span class="params">obj</span>) </span>&#123;</div><div class="line">  <span class="keyword">var</span> _options = obj.options,</div><div class="line">    <span class="comment">//获取canvas1图片数据</span></div><div class="line">    canvas1 = <span class="built_in">document</span>.getElementById(_options.canvas_id + <span class="string">"1"</span>),</div><div class="line">    ctx1 = canvas1.getContext(<span class="string">'2d'</span>),</div><div class="line">    <span class="comment">//导出canvas1图片数据，可能有跨域问题哦</span></div><div class="line">    imgData = ctx1.getImageData(_options.canvas_left, _options.canvas_top, _options.canvas_width, _options.canvas_height),</div><div class="line">    canvas3 = <span class="built_in">document</span>.createElement(<span class="string">"canvas"</span>),</div><div class="line">    ctx3 = canvas3.getContext(<span class="string">'2d'</span>),</div><div class="line">    _image;</div><div class="line">  canvas3.width = _options.canvas_width;</div><div class="line">  canvas3.height = _options.canvas_height;</div><div class="line">  <span class="comment">//将图片数据输出到canvas3</span></div><div class="line">  ctx3.putImageData(imgData, <span class="number">0</span>, <span class="number">0</span>);</div><div class="line">  <span class="comment">//将canvas3转换成图片</span></div><div class="line">  _image = canvas3.toDataURL(<span class="string">"image/jpg"</span>);</div><div class="line">  <span class="keyword">return</span> _image;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
</li>
</ul>
<h2 id="鼠标或者触屏事件处理"><a href="#鼠标或者触屏事件处理" class="headerlink" title="鼠标或者触屏事件处理"></a>鼠标或者触屏事件处理</h2><hr>
<ul>
<li>鼠标事件为mousedown/mousemove/mouseup，相应js文件为mousestyle.js<ul>
<li>鼠标获取坐标位置可参考<a href="">js判断某个位置是否特定元素</a></li>
</ul>
</li>
<li>触屏事件为touchstart/touchmove/touchend，相应js文件为touchstyle.js<ul>
<li>触屏事件获取坐标位置为event.touches[0].clientX和event.touches[0].clientY</li>
</ul>
</li>
<li><p>在裁剪过程中，全程绑定开始事件（mousedown/touchstart）的检测</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div></pre></td><td class="code"><pre><div class="line"><span class="comment">//此处为鼠标事件部分代码</span></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">mouseStart</span>(<span class="params"></span>) </span>&#123;</div><div class="line">  <span class="comment">//getMousePos为获取鼠标坐标的方法，此处不详细讲解</span></div><div class="line">  mousestartX = that.getMousePos(event).x - _l;</div><div class="line">  mousestartY = that.getMousePos(event).y - _t;</div><div class="line">  <span class="comment">//判断鼠标位置是否为裁剪框的角，并针对不同角绑定不同的移动事件</span></div><div class="line">  <span class="keyword">if</span> (((_left - <span class="number">20</span>) &lt; mousestartX &amp;&amp; mousestartX &lt; (_left + <span class="number">20</span>)) &amp;&amp; ((_top - <span class="number">20</span>) &lt; mousestartY &amp;&amp; mousestartY &lt; (_top + <span class="number">20</span>))) &#123;</div><div class="line">    <span class="comment">//此处为裁剪框左上角，可调整裁剪框大小</span></div><div class="line">    <span class="built_in">document</span>.addEventListener(<span class="string">"mousemove"</span>, changeLeftTop, <span class="literal">false</span>);</div><div class="line">    <span class="built_in">document</span>.addEventListener(<span class="string">"mouseup"</span>, mouseEnd, <span class="literal">false</span>);</div><div class="line">  &#125; <span class="keyword">else</span> <span class="keyword">if</span> (((_right - <span class="number">20</span>) &lt; mousestartX &amp;&amp; mousestartX &lt; (_right + <span class="number">20</span>)) &amp;&amp; ((_bottom - <span class="number">20</span>) &lt; mousestartY &amp;&amp; mousestartY &lt; (_bottom + <span class="number">20</span>))) &#123;</div><div class="line">    <span class="comment">//此处为裁剪框右下角，可调整裁剪框大小</span></div><div class="line">    <span class="built_in">document</span>.addEventListener(<span class="string">"mousemove"</span>, changeRightBottom, <span class="literal">false</span>);</div><div class="line">    <span class="built_in">document</span>.addEventListener(<span class="string">"mouseup"</span>, mouseEnd, <span class="literal">false</span>);</div><div class="line">  &#125; <span class="keyword">else</span> <span class="keyword">if</span> ((_left + <span class="number">20</span>) &lt; mousestartX &amp;&amp; (_right - <span class="number">20</span>) &gt; mousestartX &amp;&amp; (_top + <span class="number">20</span>) &lt; mousestartY &amp;&amp; (_bottom - <span class="number">20</span>) &gt; mousestartY) &#123;</div><div class="line">    <span class="comment">//此处为裁剪框里面，可移动裁剪框</span></div><div class="line">    <span class="built_in">document</span>.addEventListener(<span class="string">"mousemove"</span>, changeMove, <span class="literal">false</span>);</div><div class="line">    <span class="built_in">document</span>.addEventListener(<span class="string">"mouseup"</span>, mouseEnd, <span class="literal">false</span>);</div><div class="line">  &#125; <span class="keyword">else</span> &#123;</div><div class="line">    <span class="keyword">return</span>;</div><div class="line">  &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
</li>
<li><p>触发开始事件后，开始绑定移动（mousemove/touchmove）和结束事件（mouseup/touchend）的检测</p>
<ul>
<li>具体的实现这里不详细说明，大家可查看源文件获取</li>
</ul>
</li>
</ul>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>曾经我很喜欢用下划线命名变量，被小伙伴们吐槽过很多遍，这些代码还处于那个时代的产物，小伙伴们请见谅呀。</p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
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	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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